Aneutral atom of potassium (k) has an average mass of 39 amu and 19 electrons. how many neutrons does it have? 10 19 20 58

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.